62 research outputs found
A note on Higgs decays into boson and
Rare decays with denoting the narrow or
resonances, such as or states, have been analyzed. Within
the standard model, these channels may proceed through the tree-level
transition with the virtual , and also loop-induced
process , followed by . Our analysis shows that,
for the bottomonium final states, the decay rate of from the
loop-induced process is small and the former transition gives the dominant
contribution; while, for the charmonium final states,
and induced by could be
comparable to the contribution given by the tree-level
transition.Comment: 6 pages, 2 figure
Rare -boson decays into a vector meson and lepton pair
We have presented a theoretical study of exclusive rare -boson decays,
with denoting a neutral vector meson and
or , in the standard model. The leading-order contributions to
these processes are given by with the
subsequent transition. Branching fractions of these decay
modes, for , , , and , respectively, have been
calculated and predicted around , which are surprisingly
larger than those of two-body hadronic radiative decays
with denoting a pseudoscalar or vector meson. Thus it is expected that rare
decays into a neutral vector meson plus lepton pair may be the promising
channels in future experimental facilities with a large number of -boson
events produced.Comment: 8 pages, 3 figures. Some discussions added. Published versio
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